Is there any way to hang up on blocked callers automatically without sending them to voicemail?

Once a call reaches the phone the only thing you can do is send it to voicemail. See if your carrier has a blocking app that can prevent spam calls from getting to your phone in the first place.

That’s a good idea. Spammers don’t know who they are calling anymore, and they don’t care if a line is valid or not.

Thanks. I thought so but wasn't sure.

If you want to do it manually, I suppose you should just answer and then hang up very quickly. Lawrence may know better than I if that increases the chances you'll get more spam calls.